mv.c revision 1.1.1.1 
1/*
2 * Copyright (c) 1989 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Ken Smith of The State University of New York at Buffalo.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38char copyright[] =
39"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
40 All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44static char sccsid[] = "@(#)mv.c	5.11 (Berkeley) 4/3/91";
45#endif /* not lint */
46
47#include <sys/param.h>
48#include <sys/time.h>
49#include <sys/wait.h>
50#include <sys/stat.h>
51#include <fcntl.h>
52#include <errno.h>
53#include <unistd.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include "pathnames.h"
58
59int fflg, iflg;
60
61main(argc, argv)
62	int argc;
63	char **argv;
64{
65	extern char *optarg;
66	extern int optind;
67	register int baselen, exitval, len;
68	register char *p, *endp;
69	struct stat sb;
70	int ch;
71	char path[MAXPATHLEN + 1];
72
73	while (((ch = getopt(argc, argv, "-if")) != EOF))
74		switch((char)ch) {
75		case 'i':
76			iflg = 1;
77			break;
78		case 'f':
79			fflg = 1;
80			break;
81		case '-':		/* undocumented; for compatibility */
82			goto endarg;
83		case '?':
84		default:
85			usage();
86		}
87endarg:	argc -= optind;
88	argv += optind;
89
90	if (argc < 2)
91		usage();
92
93	/*
94	 * If the stat on the target fails or the target isn't a directory,
95	 * try the move.  More than 2 arguments is an error in this case.
96	 */
97	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
98		if (argc > 2)
99			usage();
100		exit(do_move(argv[0], argv[1]));
101	}
102
103	/* It's a directory, move each file into it. */
104	(void)strcpy(path, argv[argc - 1]);
105	baselen = strlen(path);
106	endp = &path[baselen];
107	*endp++ = '/';
108	++baselen;
109	for (exitval = 0; --argc; ++argv) {
110		if ((p = rindex(*argv, '/')) == NULL)
111			p = *argv;
112		else
113			++p;
114		if ((baselen + (len = strlen(p))) >= MAXPATHLEN)
115			(void)fprintf(stderr,
116			    "mv: %s: destination pathname too long\n", *argv);
117		else {
118			bcopy(p, endp, len + 1);
119			exitval |= do_move(*argv, path);
120		}
121	}
122	exit(exitval);
123}
124
125do_move(from, to)
126	char *from, *to;
127{
128	struct stat sb;
129	int ask, ch;
130
131	/*
132	 * Check access.  If interactive and file exists, ask user if it
133	 * should be replaced.  Otherwise if file exists but isn't writable
134	 * make sure the user wants to clobber it.
135	 */
136	if (!fflg && !access(to, F_OK)) {
137		ask = 0;
138		if (iflg) {
139			(void)fprintf(stderr, "overwrite %s? ", to);
140			ask = 1;
141		}
142		else if (access(to, W_OK) && !stat(to, &sb)) {
143			(void)fprintf(stderr, "override mode %o on %s? ",
144			    sb.st_mode & 07777, to);
145			ask = 1;
146		}
147		if (ask) {
148			if ((ch = getchar()) != EOF && ch != '\n')
149				while (getchar() != '\n');
150			if (ch != 'y')
151				return(0);
152		}
153	}
154	if (!rename(from, to))
155		return(0);
156
157	if (errno != EXDEV) {
158		(void)fprintf(stderr,
159		    "mv: rename %s to %s: %s\n", from, to, strerror(errno));
160		return(1);
161	}
162
163	/*
164	 * If rename fails, and it's a regular file, do the copy internally;
165	 * otherwise, use cp and rm.
166	 */
167	if (stat(from, &sb)) {
168		(void)fprintf(stderr, "mv: %s: %s\n", from, strerror(errno));
169		return(1);
170	}
171	return(S_ISREG(sb.st_mode) ?
172	    fastcopy(from, to, &sb) : copy(from, to));
173}
174
175fastcopy(from, to, sbp)
176	char *from, *to;
177	struct stat *sbp;
178{
179	struct timeval tval[2];
180	static u_int blen;
181	static char *bp;
182	register int nread, from_fd, to_fd;
183
184	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
185		error(from);
186		return(1);
187	}
188	if ((to_fd = open(to, O_CREAT|O_TRUNC|O_WRONLY, sbp->st_mode)) < 0) {
189		error(to);
190		(void)close(from_fd);
191		return(1);
192	}
193	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
194		error(NULL);
195		return(1);
196	}
197	while ((nread = read(from_fd, bp, blen)) > 0)
198		if (write(to_fd, bp, nread) != nread) {
199			error(to);
200			goto err;
201		}
202	if (nread < 0) {
203		error(from);
204err:		(void)unlink(to);
205		(void)close(from_fd);
206		(void)close(to_fd);
207		return(1);
208	}
209	(void)fchown(to_fd, sbp->st_uid, sbp->st_gid);
210	(void)fchmod(to_fd, sbp->st_mode);
211
212	(void)close(from_fd);
213	(void)close(to_fd);
214
215	tval[0].tv_sec = sbp->st_atime;
216	tval[1].tv_sec = sbp->st_mtime;
217	tval[0].tv_usec = tval[1].tv_usec = 0;
218	(void)utimes(to, tval);
219	(void)unlink(from);
220	return(0);
221}
222
223copy(from, to)
224	char *from, *to;
225{
226	int pid, status;
227
228	if (!(pid = vfork())) {
229		execl(_PATH_CP, "mv", "-pr", from, to, NULL);
230		error(_PATH_CP);
231		_exit(1);
232	}
233	(void)waitpid(pid, &status, 0);
234	if (!WIFEXITED(status) || WEXITSTATUS(status))
235		return(1);
236	if (!(pid = vfork())) {
237		execl(_PATH_RM, "mv", "-rf", from, NULL);
238		error(_PATH_RM);
239		_exit(1);
240	}
241	(void)waitpid(pid, &status, 0);
242	return(!WIFEXITED(status) || WEXITSTATUS(status));
243}
244
245error(s)
246	char *s;
247{
248	if (s)
249		(void)fprintf(stderr, "mv: %s: %s\n", s, strerror(errno));
250	else
251		(void)fprintf(stderr, "mv: %s\n", strerror(errno));
252}
253
254usage()
255{
256	(void)fprintf(stderr,
257"usage: mv [-if] src target;\n   or: mv [-if] src1 ... srcN directory\n");
258	exit(1);
259}
260